Graphs, information, what fun!

 

Platinum Member
Username: Jan_b_vigne

Dallas, TX

Post Number: 13466
Registered: May-04
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http://www.cartridgedb.com/



It's rather simple if you follow the steps laid out on the web page.

Start with the "Tonearm/Turntable Database" (http://www.cartridgedb.com/default_arms.asp) which you'll find on the main page of the link. Put in the information you have for your tonearm; manufacturer and model will be sufficient if your arm is in the database. Keep this information handy as you open another window to reach the "Cartridge Database" (http://www.cartridgedb.com/) which is the main link in this post.

On the Caratridge page find your information for the specific cartridge you are interested in. Do this by inserting your cartridge manufacturer and the model, once again this amount of information should be sufficient if your cartridge is in the database. Keep this page open while you move to one of two places, either "Cartridge Resonance Evaluator" by clicking on the tab or "Cartridge Database Tools" which you can find at the top of the "Cartridge Database" page.


Follow directions after that. On the "Cartridge Database Tools" page you'll find the simplest way to get the results you want with decimal point accuracy. Just insert your arm's effective mass in grams in the "Tonearm Effective Mass" slot and your cartridge's mass in the slot for "Cartridge Mass" and its compliance in the slot provided for "Compliance". This provides a simple read out that is to a decimal point accurate.

To check this and get a better idea of the range your tonearm will accept in cartridge compliance use the "Cartridge Resonance Evaluator". This will provide a graph with horizontal and vertical axis that might be more useful for oddball arms or cartridges.

For example, my RB300 arm has an effective mass of 11.5 grams while the Grado Sonata has a mass of 6.5 grams with a compliance of 20 X 10-6 cm/Dyne. Together they yeild a resonance of 8.38Hz. Pretty close to peachy keen!


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Silver Member
Username: Hawkbilly

Nova Scotia Canada

Post Number: 548
Registered: Jul-07
My combination is right on the edge of the green, but in the green. Same arm as you with a, Ortofon 2m bronze is a 22 x 10-6/Dyne and 7.2g. Cool info JV.
 

Platinum Member
Username: Nuck

Post Number: 11980
Registered: Dec-04
Where is the mass of mounting hardware found?
 

Platinum Member
Username: Nuck

Post Number: 11981
Registered: Dec-04
Which protractor would you use for the HW19, RB250/300 JV?
It's the Dyna cart, so the Rega one doesn't look right.

And thanks!
 

Platinum Member
Username: Jan_b_vigne

Dallas, TX

Post Number: 13467
Registered: May-04
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You'll have to guess at the mounting hardware's mass. If your cartridge/arm combination isn't on the boderline of poor matching, don't worry about it.



If I remember correctly, the Rega protractor is a one point alignment. It should be easy to get the alignment to look right with this protractor.


Go online or check the forum archives for a "free protractor". Any two point guage will work as long as it fits the effective length of the Rega arm.


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